The gas-phase dehydrogenation of ethane to ethylene C2H C2H4 + H2 - proceeds through the elementary reaction steps C2H6 + H CzHs + H2 C2H6 CzHs - H C2Hs C2H4 +H (a) Identify the initiation, propagation, and termination steps. (b) Find a reasonable expression for r(Cczne). (c) The bond energy of ethane is 104 kcal/mole, and the propagation steps have very low activation energies. What is the approximate activation energy of this reaction